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Structural Chemistry

, Volume 28, Issue 3, pp 617–624 | Cite as

Field-induced π-polarization in barrelene derivatives: a computational study based on structural variation

Original Research

Abstract

Barrelene, H–C(CH=CH)3C–H, is an unsaturated polycyclic hydrocarbon containing three isolated double bonds in a non-planar arrangement. We have studied the transmission of field effects through the barrelene framework by analyzing the small structural changes occurring in the phenyl group of many Ph–C(CH=CH)3C–X molecules, where X is a variable substituent. Molecular geometries have been determined by quantum chemical calculations at the HF/6-31G* and B3LYP/6-311++G** levels of theory. Comparison with the results obtained for the corresponding saturated molecules, the bicyclo[2.2.2]octane derivatives Ph–C(CH2–CH2)3C–X, reveals a small, but significant, field-induced π-polarization of the barrelene cage, especially when the remote substituent is a charged group. Additional evidence of π-polarization is obtained by comparing the electric dipole moments of the two sets of uncharged molecules. The structural variation of the barrelene cage caused by the variable substituent in Ph–C(CH=CH)3C–X molecules has also been investigated. It is much larger than that of the phenyl group and depends primarily on the electronegativity of the substituent. Particularly pronounced is the concerted variation of the non-bonded distance between the bridgehead carbons of the cage, r(C···C) 1 BARR , and the average of the three C–C–C angles at the cage carbon bonded to the variable substituent, α 1 BARR . A scattergram of r(C···C) 1 BARR versus the corresponding parameter for bicyclo[2.2.2]octane derivatives, r(C···C) 1 BCO , shows that the variation of r(C···C) 1 BARR becomes gradually less pronounced than that of r(C···C) 1 BCO as the electronegativity of the substituent increases.

Keywords

Substituted barrelenes Substituted bicyclo[2.2.2]octanes Structural variation Dipole moments Field effect Electronegativity effect Field-induced π-polarization 

Notes

Acknowledgments

This work was supported by the CINECA Supercomputing Center, Bologna, with Project IsC10_DYNGEO_E, and by the Department of Chemistry, Sapienza - University of Rome, through the Supporting Research Initiative 2013.

Supplementary material

11224_2016_829_MOESM1_ESM.doc (599 kb)
Supplementary material 1 (DOC 599 kb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of ChemistrySapienza - University of RomeRomeItaly
  2. 2.Department of Physical and Chemical SciencesUniversity of L’AquilaL’AquilaItaly

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